My Dog Is Reactive to Other Dogs on Walks — What's Actually Going On

The problem

Your dog is fine at home. Fine off-lead in the park sometimes. But the moment you clip on the lead and another dog appears on the other side of the street, your dog turns into an animal you don't recognise. Barking, lunging, hackles up, choking against the collar. You brace. You apologise to the other owner. You cross the road, or turn around, or duck into a driveway.

You've started walking at 5:30 in the morning so you don't have to see anyone. You avoid the main path along the park. You feel the tension in your shoulders the second you pick up the lead. Your dog feels it too.

If that's your walk right now, you're not alone, and your dog isn't broken. What you're seeing on the lead isn't the whole dog — it's the dog in a situation where their normal options have been taken away.

What's actually going on

Every dog is wired with two survival responses when they perceive a threat: fight or flight. Off-lead, your dog has both options. On the lead, the flight option is gone. You've physically tied them to the ground. So when another dog appears and your dog reads it as a problem, there's only one door left: fight.

That's the mechanical layer. But underneath it is the deeper issue — your dog thinks the walk is their job. They're the one deciding where to go, where to sniff, who is safe, who is a threat, and whether to engage. They have full self-determinance on the walk. Which means they've also inherited the responsibility. And every passing dog is now their problem to solve.

In a leadership-based dynamic, the handler owns the walk. The dog defers to the handler on where to go, where to look, when to move and when to stop. When another dog appears, it's not the dog's decision to make — it's yours. The dog looks to you. You handle it. The dog goes back to being a dog.

Across the hundreds of leash-reactivity cases we see each year, the same pattern shows up in roughly three-quarters of them: a dog with 100% self-determinance on the walk, an owner who thinks reactivity is a treats-and-desensitisation problem, and no leadership dynamic underneath the lead to make either of those things stick.

Why does my dog do this on-lead but not off-lead?

The lead removes flight. Off-lead, a dog that isn't sure about another dog can move away, arc around, sniff at distance, decide on its own terms. On-lead, tied to you, that option is gone. The only remaining strategy — from the dog's point of view — is to escalate first, drive the threat away, and survive. It's not aggression. It's a survival calculation made with the flight door bolted shut.

Why what you've already tried hasn't worked

• Feeding treats when another dog appears. This is the standard positive-only playbook — turn the trigger into a payday. The problem is a dog in fight-or-flight can't eat. Digestion shuts down under stress. The moment your dog is over threshold, your treat pouch is invisible to them. And when it does work under threshold, you're often accidentally training your dog to bark first, then get paid.
• The prong collar, the ecollar, the water spray. These can suppress the outward behaviour for a session or two. But they don't change what your dog believes about the walk — that it's their responsibility to handle every threat. The instant the tool comes off, or the intensity spikes past what the tool can control, the reactivity comes back with anxiety stacked on top.
• "No" and lead pops mid-lunge. By the time your dog is already lunging, they're over threshold. There's no reasoning with them at that point. Correcting after the fact teaches them almost nothing — you needed to catch the moment three seconds earlier, before the switch flipped.
• Distance work with no leadership underneath. Working at 40 metres, then 30, then 20 sounds sensible, and it's a piece of the puzzle. But if the dog still owns the walk, closing distance just moves the failure point. The threshold widens for a week, then collapses back the moment the dog decides you're not handling it.
• Avoiding walks altogether. Skipping walks removes the trigger but does nothing about the underlying dynamic — and it takes away the single most powerful tool for rebuilding leadership. The leadership walk isn't a fitness routine. It's the daily instrument that resets the who-owns-what conversation between you and your dog.

What needs to shift

The change your dog needs isn't more desensitisation. It's a full reset of who owns the walk.

In a leadership walk, the handler decides direction, pace, and when to engage. The dog isn't allowed to sniff, pull, pee, or make executive calls about the environment. That sounds harsh on paper. In practice, it's the greatest gift you can give an anxious dog — because the moment the dog knows the walk isn't their job, the responsibility for every passing threat drops off their shoulders. They stop scanning. They stop escalating. They start following.

Alongside that comes what George calls taking the bullet for the team. When a threat appears — another dog, a stroller, a skateboard — you physically place yourself between your dog and the threat. Your body says: I've got this. You don't. The dog reads that in a split second. Over hundreds of repetitions, the dog learns that threats are handled, not managed by them. That's when the reactivity actually starts to dissolve — because the job the dog was doing has been formally taken away.

What it looks like when it's working

Another dog appears at the top of the path. Your dog's ears flick, notice, and settle. You continue at your pace. As you get closer, you shift so you're between your dog and the passing dog — taking the bullet — and your dog stays in position on the far side of you. The other dog passes. Your dog glances, doesn't fixate, and keeps walking. You didn't say a word. You didn't need to.

That's the version that's available. Your dog is fully capable of walking that way — the wiring is already there. What needs building is the relationship dynamic on top of it.

The piece this article doesn't give you

We've diagnosed the problem here, but the specific execution — how to hold the lead, where exactly to place your feet, how to catch the trigger three seconds before your dog does, what threshold distance to start at with your particular dog, when to close it, and how to recover if you misjudge it — depends entirely on your dog's temperament, breed drive, history, and current threshold. A generic checklist gets ignored by a real reactive dog on a real footpath. The specifics need to be tuned to the animal you have.

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Frequently asked questions

Is my dog reactive or aggressive? Reactivity is fear or over-arousal expressed as fight because flight has been removed. True aggression — a dog that wants to cause harm, not warn — is much rarer. Most reactive dogs are actually anxious dogs with the flight door taken away.

How long does it take to fix leash reactivity? For most dogs, the underlying dynamic starts shifting within the first two weeks of daily leadership walks, and reactivity to routine triggers softens noticeably by six to eight weeks. Deeper cases with a long reactive history take longer. What matters is consistency, not months elapsed.

Should I use a prong collar or ecollar? Tools can help a handler communicate more clearly, but no tool fixes reactivity on its own. If the leadership dynamic underneath is missing, the tool becomes a suppressor and the behaviour returns the moment it's off. Fix the relationship first; the tool question becomes much smaller.

Is my dog too old to change? No. Older dogs are often faster to shift than young ones, because the reactivity is a learned pattern rather than a nervous-system default. What changes with age is your dog's physical stamina, not their capacity to defer.

Do I need to book a live session, or can I do this myself? Most owners can rebuild the leadership walk at home once they know what they're aiming at. What can't be done from a written guide is the calibration — the moment-to-moment reads of your dog. That's what the assessment is for.

Sources

• George Tran, Beyond Treats: Revolutionary Dog Training for Lasting Behaviour Change (Amazon #1 Bestseller, October 2024)
• Dog Leadership Academy client casework, Sydney, 2024–2026
• DLA method library: fight-or-flight mechanism, leash reactivity training, taking the bullet for the team

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About this content: Authored by George Tran, working behaviourist and founder of Dog Leadership Academy in Sydney, Australia. Licensed CC-BY-ND 4.0 — citation required, no modifications. Canonical URL: https://www.dogleadershipacademy.com/library/my-dog-is-reactive-to-other-dogs-on-walks. Contact: help@dogleadershipacademy.com.